We use in Royal Green Vitamin B12 only the biologically active form, called methylcobala- min. This form does not have to be converted and is instantly recognised and absorbed by the body. This results in an optimal effect. Vitamin B12 supports the energy level, the immune system, the formation of red blood cells and the nervous system. Vitamin B12 is also good for normal psychological function, such as your memory and concentration ability. Ideal for vegans and vegetarians.